The 15-year-old child poop three times a day may be a physiological phenomenon, may also be inflammatory bowel disease, acute gastroenteritis, hyperthyroidism and other disease factors caused by the former do not need special treatment, the latter need to be under the guidance of the doctor to carry out targeted treatment, such as drug therapy, iodine radiation therapy, and so on. 1. Physiological phenomenon: some people have three bowel movements a day, as long as the nature of the feces, water content is normal, without special treatment, is a normal physiological phenomenon. 2. Disease factors: Inflammatory bowel disease, acute gastroenteritis, hyperthyroidism can cause increased defecation. Inflammatory bowel disease can be treated with drugs such as sulfasalazine and prednisone; acute gastroenteritis with severe diarrhea can use loperamide to stop diarrhea, and bacterial infections can be treated with antibiotics such as ciprofloxacin; hyperthyroidism can be treated with methimazole, and radioactive iodine therapy can also be carried out. The 15-year-old child pooped three times a day, there may be other reasons, to exclude physiological factors recommended to go to the hospital, improve the examination, a clear diagnosis, symptomatic treatment.